Form hanger



Sept; 8, 1931. G E, GREENWOOD 1,821,969

FORM HANGER Filed Jan. 50, 1929 Patented Sept. 8, 1931 UNITED STATESGEORGE E. GREENWOOD, OF SAN FRANCISCO, CALIFORNIA FORM HANGERApplication filed January 30, 1929. Serial No. 336,097.

My invention relates particularly to forms useful in buildingconcretestructures and which are especially adapted for the encasementof structural beams such as I-beams,

for sheathing them in concrete. Devices of this characterare disclosedin my copending application entitled Concrete form hanger; filed August21, 1928, and bearing Serial Number 301,033.

It is an object of my invention to provide a form hanger'which isadjustable for use with a wide range of sizes of beams such as areemployed commercially in the construction of buildings.

Another object of my invention is to provide a form hanger which may beapplied with a standard width of form bottom to encase beams of varyingwidth.

Another object of my invention is to 0b 29 viate inaccuracies in thedimensions of the finished concrete sheath.

An additional object of my invention is to provide a form hanger whichis easily removable after the concrete has been poured.

Another object of my invention is to provide a form hanger which can beused re-- peatedly for a number of different sized beams.

The foregoing and other objects are attained in the embodiment of theinvention shown in the drawings, in which i Fig. 1 is a cross section ona transverse plane of an I-beam to which the form hanger of my inventionhas been applied.

Fig. 2 is a perspective view oft-he form hanger shown in the Figure 1with portions thereof broken away.

Fig. 3 is a transverse section showing a portion of my form hangerhaving modified details.

Fig. 4 is a transverse section in perspective of an additionallymodified form of my invention.

In its preferred form, the hanger of my invention comprises a spaceradapted to be adjustably secured to a beam and to which in turn isadjustably secured a form bottom, the spacer having the functions ofproperly positioning the form bottom and of properly positioning theform sides as well.

in the modification of my invention disclosed in Fig. 1, there is showna beam 6 which is of the shape commercially known as an I-beam and whichis to be encased, or sheathed in concrete. In different structures,vanous different shapes of beams are employed and also beams of the samegen-. eral cross section but with varying flange thicknesses and webthicknesses. It is to be enabled to employ a form hanger withoutmaterial change with any'of the beam sizes and shapes that are apt to beencountered in commercial practice that I provide the structure shown.This preferably comprises a pair of spacers 7 disposed on either side ofthe beam and contacting the lower face of the lower flanges thereof. Asshown in Figs. 1 and 2, these faces are easily made by severing themfrom channels or other suitable structural shapes which have therequishe ri idity on the web and flanges thereof. For positioning thespacers 7, I preferably provide a hooked bolt 8 passing thru an aperturein the upper flange of the channel and having a threaded end to which anut 9 is secured for clamping the spacers 7 tightly against the flangeof the beam 6. By virtue cf this variable connection fixture, it iseasily pos ible to secure tightly the spacers T to anyone of a number ofbeams having various flange thicknesses with only the necessity ofadjustingthe nut 9. As the nut 9 is tightened the spacers 7, which arecapable of rotative movement about the axis of the bolt are usuallyturned in the direction of rotation of the nut. Inasmuch as the spacersare ordinarily severed from a channel on a transverse plane normal tothe longitudinal edges of the'channel the distance between the edge ofthe lower flange of the beam 6 to the corner of the spacer is apt tovary. In some instances the corner ofthe spacer will be brought intodirect contact with the forms surrounding the beam which may result inthe misali nment ofthe form or ofthe bean. This is an undesirable resultand in my prior application I show a incl-us for positively holding thespacer 7 in proper relationship. In the present instance,zl preferablyround or cut in an arcur obviate the use OI securing nuts.

ate manner the end of the spacer 7 and thus thru any of the usual.pivotal positions, the distance between the edge of the beam flange andof an extreme part of the spacer is exactly the same.

Held at a predetermined distance from the beam by means of the spacers'7 is a form bottom- 11 which preferably is of sufficient width for arange of difierent size beams and which preferably is reinforced by across member 12 having a pair of longitudinally extending bolt slots 13therein. For securing the form bottom 11 adjustably to-the spacer andthereby positioning, it in a predetermined manner with respect to thebeam 6, bolts 1; are preferably inserted thru the slots 13 and extendthru the lower flanges of the spacers T and terminate within the channel portions thereof. Preferably the terminal ends of the bolts arethreaded to receive nuts 16 which are capable of adjustment for properlyrelating the various parts. Supported by the form bottom 11 andrelatively located by the spacers 7 are form sides 1'? which are heldagainst the spacers by strips 1.8 nailed. in place and areproperlyseparated atthe upper ends by a cross member 19 also nailed inplace.

In. the form of my invention shown in Figure 3, 1 preferably providespacers 21 which are inmost respects similar to the spacers 7 shown inFigure 1 but are relatively thick and are-tapped in their apertures forreceiving the fastenin bolts 22 and 23 so as to By simply rotatingthe-hooked bolt 22 and the fastening bolt 23, a suitable adjustment ofthe spacers 21 with respect to the beam 26 is provided and also asuitable adjustment of the form bottom 27. with respect to the spacer 21is provided. In other respects, the modification is substantially asshown in Figure 1.

In Figure 4 is shown an additional modification in that the spacersthemselves are of slightly different construction although the remainderof the organization is identical. In. this instance, spacers-30 insteadof being made of commercial shapes such as channels are preferablyformed fromflat strips sevthe beam encased in concrete. WVhen theconcrete has set, the form sides are removed and the form bottom islikewise detached from the spacers which are left in place. It is notnecessary, as has been the case with previous devices to clip or shearoff projecting bolts,.but in this instance the fastening bolts needsimply to be unscrewed and they can then be readily removed from theconcrete encasement along with the forms. Not only (lo-thepartsremaining in the concrete form a suitable point of attachment forsubsequent structures but they also render the removal of theformsthemselves quite simple.

I claim:

A form hanger for use with any one of a plurality of different beamscomprising a form, bottom, a. spacer interposed between said: formbottomand any selected one of said beams, hooked bolt engaging saidselected one of said beams and piercing said spacer, means within theconfines of said spacer for clamping saidispacer and said bolt on said,

selected one of said beams, and means for clamping. together said spacerand said form bottom.

In testimony whereof, Ihave hereunto set my hand GEORGE E. GREENWOOD.

ered along arcuate lines 31 and bent upon.

themselves to enclose a central channel 32.. These spacers 21 receivewithin their channel portions the adjustable fastenings 33: and. 34:which secure the hook bolt 36 and the fastening' bolt 37 to the formbottom 38 and the beam 39-.

lVith any of the modifications of my invention, the form bottom 11 ispreferably assembled with the spacers into a single unit which hoistedinto position below the beam whereupon the hook bolts are put in placeand are fastened; It will be appreciated that any width beam will beaccommodated by this construction and that after the form bottom is inplace the form sides can be installed and

